Healthcare network is an emergent organization mode which we were able to observe via RPM ("Réseau Pôle Mémoire" in French, which means memory pole network), dedicated to the medico-psycho-social coverage of people suffering from memory confusions. We define this collective as a community of action and we describe its functioning in order to suggest computer features allowing to support cooperative work between the professionals engaged in this network. In this article, we first position our work towards other researches on computer-supported medical activities. Then, we present RPM and suggest an analysis framework. We expose our first results after one year of observation, and we finally suggest improvements of the design of the cooperative information system.